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ANIMALS – RECEPTION, RESPONSES AND CO¬ORDINATION   The nervous and endocrine systems (together known as the neuro-endocrine system) act as a co-coordinating system. They linking the receptors to the effectors and regulating their activities. Receptors Receptors are cells that detect or receive stimuli. They may be scattered more uniformly all over the body surface e.g. receptors for pain, touch, temperature; or they may be located in a special sense organ e.g. receptors for light, sound, taste and smell. Motor nerves link the Central Nervous System (CNS) to the effectors. Its cell body is located at one end of the axon. It transmits nerve impulses from the CNS to the effectors.   Effectors These are the cells, organs, or organelles which enable the organism to respond. They include muscles, glands, cilia and flagella.   See also: PRODUCTION OF AUXINS AND THEIR EFFECTS ON PLANT GROWTH RECEPTION, RESPONSE AND CO-ORDINATION IN PLANTS… Read More »ANIMALS – RECEPTION, RESPONSES AND CO¬ORDINATION



PLANTS – RECEPTION, RESPONSE AND CO-ORDINATION   Introduction The structures involved in detecting the changes may be located far away from the ones that respond. There is need for a communication system within the body. The nervous system and the endocrine system perform this function, i.e. linking the parts of the body that detect changes to those that respond to them.   Irritability Living organisms are capable of detecting changes in their internal and external environments and responding to these changes in appropriate ways. This characteristic is called irritability, and is of great survival value to the organism. Stimuli A stimulus is a change in the internal or external environment to which an organism responds. Examples of stimuli include light, heat, sound, chemicals, pH, water, food, oxygen and other organisms A response is any change shown by an organism in reaction to a stimulus. The response involves movements of the… Read More »PLANTS – RECEPTION, RESPONSE AND CO-ORDINATION

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